When dragging a tab from Firefox to Chrome/Chromium, or the other way, why is it not accepted by the other browser? One would expect the tab that was dragged over to appear together with the other tabs.
Is this a problem with the X11 (or Wayland) protocol, a problem with the respective browsers or just a lack of standards for drag and drop between applications?
What would it take to make it possible? Start writing patches for Firefox and Chrome/Chromium while crossing the fingers that the patches would both be possible to write and be accepted? Contact the freedesktop.org people?
The user interaction is meaningful. Why is it not currently possible and what would it take to make it so?